How do you implement OmniAuth on Rails 2.2?

问题

I am trying to implement Facebook and Twitter authentication using Omniauth for an existing Rails 2.2 application. So far I have been unable to find any advise on how to do this in Rails 2.2 - hence this question. I have two questions to ask -

1. I understand Rack support for Rails was introduced from 2.3 and I believe Rack is needed for OmniAuth. So is it even possible to use OmniAuth on a Rails 2.2 website and why ?

2. If it is possible to implement OmniAuth - how would you do it ?

回答1:

You can't use the default config.gem "omniauth" ... to get it working i did the following:

1.Install omniauth manually

sudo gem install omniauth

2.Require it before the Rails Initializer in the config/environment.rb file.

require 'omniauth'
Rails::Initializer.run do |config| ....

3.In development.rb file i've added the following configuration

config.middleware.use OmniAuth::Builder do
 provider :facebook, "XXx", "YYYY", :scope => % (email user_birthday publish_stream offline_access)
end

Add as many providers as you want here .... everything else should work as expected.

来源：https://stackoverflow.com/questions/5165544/how-do-you-implement-omniauth-on-rails-2-2